Imprezza AWD GX Auto Idle/Rev issue
 

Hi, My 2000 Imprezza AWD GX Auto has just been through its MOT the only alteration required was exhaust emmisions which were corrected by resetting to factory standard. Before MOT car was running fine.
Now it has a intermittent bad idle and the revs drop (again intermittently) at around 2000 rpm. Plugs and leads changed, coil changed, No difference.
Could it be the sensors or the cat? Any suggestions please?
Cheers - Dickiedooah

Try cleaning the MAF and idle control solenoid?

Yep cheers, MAF and idle control solenoid checked and cleaned. Sadly still playing up!